Item Has Already Been Added Error

[Gohar]

From filtering box, when I select Null and then select All then the following error occurs:

Item has already been added. Key in dictionary: '(Blanks)'  Key being added: '(Blanks)'

Please see the attached screenshot.

[Raphaël MANSUY]

Hi,

I have exactly the same issue.

I've tried with the last version (2016 Q1) and I still have the problem.

Is there a workaround available ?

 

Thank you in advance

[Dess | Tech Support Engineer, Principal]

Hello Raphaël,

Thank you for writing.

I have logged it in our feedback portal. You can track its progress, subscribe status changes and add your vote/comment to it on the following link - feedback item.

I have also updated your Telerik points.

Currently, the possible solution that I can suggest is to remove the unchecked node values from the dictionary: 

this.radGridView1.FilterPopupInitialized += radGridView1_FilterPopupInitialized;

RadListFilterDistinctValuesTable selectedValues;

private void radGridView1_FilterPopupInitialized(object sender, Telerik.WinControls.UI.FilterPopupInitializedEventArgs e)
{
    RadListFilterPopup popup = e.FilterPopup as RadListFilterPopup;
    selectedValues = popup.MenuTreeElement.SelectedValues;
    popup.MenuTreeElement.TreeView.NodeCheckedChanged += TreeView_NodeCheckedChanged;
}

private void TreeView_NodeCheckedChanged(object sender, TreeNodeCheckedEventArgs e)
{
    if (e.Node.CheckState == Telerik.WinControls.Enumerations.ToggleState.Off)
    {
        if (selectedValues.Contains(e.Node.Text))
        {
            selectedValues.Remove(e.Node.Text);
        }
    }
}

I hope this information helps. Should you have further questions I would be glad to help.

 

Regards,
Dess
Telerik